DMDX Help.


Graphic Keyword

<Graphic [N,N [,N,N]]>
<gr [N,N [,N,N]]>
<bmp [N,N [,N,N]]>

variant:
JPEG Keyword

<JPEG [N,N [,N,N]]>
<jpg [N,N [,N,N]]>


    G switch alternative where the text of a frame becomes the name of a .BMP file. The first optional pair of Ns specify the top left corner location (if only the first Ns are provided then the XYJustification rules will apply), the second pair the bottom right (scaling the image as needed), four zeros signifies full screen, -1 uses a default value (like the width of the image), values can be real as per <x> and <Y> switches (although <x> and <Y> are deprecated these days and the use of <xy> is strongly recommended). If the Ns are used they override any <X> and <Y> switches, also use of the second pair of Ns will override any <BMPMultipliers>. See the Digital Video section for details on the use of the Ns.

    With the addition of the
Independent JPEG Group's libjpeg library DMDX can now read JPEG images. Without the use of the variant <JPEG> keyword the extension .JPG or .JPEG will have to be specified in the frame's text, otherwise all <JPEG> does is change the default file extension from .BMP to .JPG.

    The default positioning of graphics is slightly different than the default positioning of text, typically the bottom of the text is in the center of the screen but graphics are centered such that the middle of the graphic is in the middle of the screen. So if you want to combine the two I recommend overriding the default positioning for both of them and use specific coordinates for all frames with <xy .5,.5> and use <xyjustification center> in the parameters.

    NOTE:  There is a bug in libjpeg that causes it to leak memory each time a JPEG is loaded.  The amount of memory appears to fluctuate between 12 kilobytes and 58 kb, rather trivial for most systems (hence it's going unnoticed for more than a decade) however if thousands of JPEGS are used and <MediaLife> is not used to reduce image reloading then you can in fact use all the free heap and cause DMDX to throw an out of memory error.  Only other thing to do is convert your JPEGs to BMPs as loading BMP files does not leak memory.

    NOTE:  Filenames must not contain leading or trailing spaces as they'll be used as part of the file name and will cause DMDX to fail to open your image.  As of version 6.1.2.12 of DMDX extended characters (like Hebrew, Chinese or Arabic ones) can be used in the file name as long as the Unicode option is in use.





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